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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a972b2d941a2039085d2611dede47306ba3a956bc600a37ddec3964d4f9f7a9' 
  AND token = 'wdktdZLuPY4j7xs62Z7tYOZB/p8FDJ48M3a3H/Xh/QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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