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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bfc1800bd684bdb512289cc2733ad342a18a47e23f192de6eedd4b70f65e4a9' 
  AND token = 'vdEKJdSYWsU9TkpLaE/kqeSut8r5+wEMzuH7b5+17X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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