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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b839de5d0887905f59b04254932c1894946efb5c74185e744d64ea62161309' 
  AND token = 'qrlfTytiXP9Vkwk2EJMHDZbHqEq8uner+9Oh5qwa5xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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