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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d9d973f144153a33cc37191182349d2f96b3b2ab43f81aa2f8d4b63a0c0fa3c' 
  AND token = 'xbiQoLj2n/wZbhzcANR22kvcmjHdVokbt8xYuPYxZLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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