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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6c7becec7d6e11d9daac6ce35d5a697b6dca4d41464097888e8a439493a414' 
  AND token = 'q12auCFurPR627bFeFccRe6cN9dVcJ37KQST2mX8x5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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