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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44fe86f53fa38c34392bb5e2406282bb645089147327b06e47e58f6d2b6f1b2a' 
  AND token = '7rDlmgImXgGcPmLeyqb02DvP9zxR+r8nKRWttuEkUxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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