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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a507bc0224bcedc51db5ce364c585f693a95fb6e81e7dbb2b23480a6a7e053' 
  AND token = 'SWz/ZW6dkofTNNXMP2Z06B5ZKvzk4sTqV6x6G5cKReg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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