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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ddc7387295105dc37d739664e48c6d04d88bbb421e22c84749fd7d2b96960a' 
  AND token = 'jIXl5pYCfx2V9iuNW4gA3+oPYIn7qo2vMD4A71ifBIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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