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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e5769f0cf7d3effbd4968438263140067068245b69fc3dbc6b7c3f72897615' 
  AND token = '7oSZirwDxr+hoTc7zA8lGS8DV7o8gXp5hrbU1sI84Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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