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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d07b479db3d817a5475e02d185c4950299e48045f1134255ba9a0f045e97df5' 
  AND token = 'rGKuxsD/dp/LlTcGXcsWFHsrSfov5fAi8D1T6mfvp1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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