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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ed81105ab79e248731f67e8dfd45a5fe9eec549b191da7bbc6a57d7ff9e6678' 
  AND token = 'o0+sriWFjxxjnsmP1a7ckheYljCX1T/X+n7o7Nh6/dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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