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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6907986ba9b254d122be8f7898397f7eb904c8897f3b32b2410d49ee1ead5a2' 
  AND token = 'kfm6wND56XyI2UQMja6OIliPnHRcdui6DpMSBCeUPFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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