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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a4460ba94c0ae429a10ae543490b7f35bbdcf2358bcdc3a6919bcb30c6f31ed' 
  AND token = 'kuU7jOh+NPX44LYdozTqfzrEFS31j7rAB3hZbfwY9UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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