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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fecb1a1d8bf833dee4052265f773ecca93631a6a3422e91edf18c7c3ad690ee' 
  AND token = 'nCb8jrdmwXOBovFcB6WuS6tJUyIKKLfWNNyNWG6JdS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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