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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e78fcba42109e4cefde412b7bf3c1b79b596de50cb43731662f8edc718a47733' 
  AND token = 'yRjEsJ2fa9ILecZp+QSqHH/mw/EaBXjLUwKcia9Idsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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