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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb816e0ee41a028810cd5248c90cf3e9c4384f2d5e0f2b3c9dd012e8057a0306' 
  AND token = 'qxBFhZiHJOMmYlxuwMmiK27MDvO+Dn1mOh7okFucIzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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