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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9828cce2fdf3c33324499359ad1c4a43163a174b3482014a43b27e818ed5d6e' 
  AND token = 'HNqxOFIyh9Gvonbe8it3UGb/Y/kvkOJ6BerP8Keo6jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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