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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7484bbcb2ecf8d2d3e7f71f3c34fd5d99e6b85472c40569c54984adecaeb9768' 
  AND token = 'aVt7BpvE6IFqyije59JvBJncQQbo5sq330yRqH9h67Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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