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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88905138b94db86069aa0dd8b3dafcdd119c5ff9762fda8e10714328eb166c98' 
  AND token = 'yphl0JBqjCXRFnLA9qhaIp15YOZn4Ztxk1DCU1hbCMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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