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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3384dc162475763eb6d296a9a409b8b0c5332439125cd7b8449f234a392be50c' 
  AND token = '1HS+mJvYZzFGO5gStbOSHRz4QobtpoWgsNC0baQAnbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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