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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b0de8c75d78cc57f49d669de44554ca2b5bdebf4252e23f8bf8f75a4301fd65' 
  AND token = '5rtCiP4yAqkbr8HXZyYuO+Aw5S0LUzaNX+rqo7b7vIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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