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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c636099318eaca8636a478677d1b9b4dab5edbbbf0302a3613f5a056a06a5e' 
  AND token = 'eTrs3aE4C+Mb150/BoEj/wF8HfmN2sWnUZun6+q8KT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}