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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56b84e55b31d9c559a00c8367458c57868b14ab5dc71f8c6b6d1adc8a9de738' 
  AND token = 'wIzbsCak+orWUu/1Ygx4X7gJfgj5cwEThgu53aW5ozc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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