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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed6871c4ff40419caf8394c55d09478b9de0a2d9efe2d45553a988a9f669451' 
  AND token = '592cp843Sfp0WRNZEDJa+DQChUwlLiGP2wKaZTBYZFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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