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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ee496daea5e85f4eb18f0e589c1dd402a7b9e019f9c84ce23086a196ec9a2b' 
  AND token = '/CKKLYK6ZLsPPBWhWxWOCwCtKt3jemThgV4bP19INN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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