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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbdcd7745c0d79063d2931ad6974a1c92d8e3dc2c2fc3d05023c5e864ee51176' 
  AND token = '3MPWUtFVCs12QlNWO5rDVI9uXOL0iO9a+PDe0KJrtw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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