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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '369227d04b1f67ebf28f0cf5bb550048355a6c850a7aec37b8f3da92894e7b82' 
  AND token = '3QaZbfgrBKwQPKME3dGYcymRon/SaNFCJWRiWiYA7aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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