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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b996c262959191ebc7c6203e02cb7ec3111f426da1013e00b21d7e806f9294' 
  AND token = 'ZgmZWmeuUy5Li9ebo07/yvYxdUYpQ/p1l6oetud7H+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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