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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf313bf2dc309cc2a6e5c8e07193ef65828e107a0b3b28d82a89b038557344af' 
  AND token = 'hr52shVwT2qefXkerLQAkPB4JuSQ8WTYA50V4H5eijE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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