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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e96fd44d0d38d242b87096ab1088145c8b1b99b5851cb182287d7059ebac958' 
  AND token = 'IFYvGQmAvL6+Zdkkclb0ymrbQLrNfNqGuwqK6+K8rdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00131

JSON explain

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