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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae7b708cba7ad56d37d3b0846fb5450ce80efe40734f48b54127399ae1048e49' 
  AND token = 'rE+o+bPa5sfdCeXYIHKKIMCCQV2IOi1AFmkWX49lPmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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