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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1418bbbf99735cc4ce568ae0ab5a7db7fefb3ace6fce20561dbe75c91684b0a5' 
  AND token = 'NibK+u/9AcEcKf6AA6EsXJqcv8Idg+S32dryO3pP+Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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