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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e6a52bb3b860524547f1e92c25e1791804f290ca028298a91d6b9ed3eafa68' 
  AND token = '+1cjLQ0c228YLi0dalRb2Z5CB1ygvWLdHFUrjgfbcS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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