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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b9a45cf138cb5f2f03d8dd1a5cbe6c48cc879a9f2e51376d1627d8362b6bc8' 
  AND token = 'Oetqp4c5vE3Xxj90Pzvbz+pr+xoLmOsLd2DeRnv97d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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