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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6caa7c5b9c631f4d30f10779c3be42c7114d6c7f402de6097d5a7db28ba0efc' 
  AND token = '6oHHYqBa3iowfBASlwYyYdQarYMsQg097UX+t/tisJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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