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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a52a10960dbb6da88003bfcce3ea3f3f083ff1ede5d26f7587f0c559ba5f09' 
  AND token = 'fTPo0qZV9R9Rv6Jtyb1d/dyd121/OgdEtbKs2YATpc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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