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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd77474dbb2af11ce967cb38fa88e0b8218caf19e9a0b52b372cb64ef1f3ea2b1' 
  AND token = 'rb6Lzsg3ZwrZVSrwdhTsM3Ex4IWYiKz4IdTlcfENqJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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