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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7e199b3a9b41a7f1c844c805809b39af5e4199a717f898ac792d06c983faf4' 
  AND token = 'HCosLQ1NCG50DUcykzq7WY+JlQY+njPpMiI9grJl/9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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