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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938d81dbc0bb02144a7220ecabb31e41e5ea601ad15893b2a721c65dbe7ba81f' 
  AND token = 'MWShg1axJprUHwMbTFiuz65QkI+LZIMTI0THiZG2EDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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