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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf54ea7f6c775831d1529ab6eb7cdf3fd5b91b070c836123de6ce9c3f606d7f6' 
  AND token = 'DsZwzO/0eTHGMvts8hU7K9u8W0iMhAyC4A6r6Zx5IKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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