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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e98372fb4fa80ecd9f9fc587900aa867dc0cac0394391e01f2dc7d007748a00' 
  AND token = 'DgwNNUld+nlkjuP/d2HjIQZ0ouhIfMzJzNf6HXOWN1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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