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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec9c6306370ed3817dba8470ec1eeb7e163f1e630e49ab71349f8273f61a19f' 
  AND token = 'OrJ+Z+vZna4Awacs3S3gEmGf6YRevu7J5WejsT2+FEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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