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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2665e939c820a0b4bdf006deee77ccd7f63d8febba7a987cf846f1d9fd34db' 
  AND token = '0mqSN065HHdeEpCIJ+eIvnyt0T9p6oRx1UpyJNRFOc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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