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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65f2c610c46418d418f52904798d658bcdc158c48a49c03fbe8a3f6cd1100fe7' 
  AND token = 'n1jy0M1geH5ox50O5HGZ5jhloplHWFmnjp6ko1S9+WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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