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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ccfe3bd466e8061900230c63878cd3f844e869b2564f3f29f02c07d74766a64' 
  AND token = 'EZaqrjCZYb9Zo28BQ5a22iXrJiXCxzVEmNI54ymogrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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