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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '592a28709e48975eaf83dcc7f1941741e85bdf02a52e5ce0d8a9b1306858b91a' 
  AND token = 'qwYs6h0oXFfAtYOe/3R54QJXWYyX4iLlXoSbTvodNn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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