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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c045f36350e4dfd4394038e7c3a13528a93a424896fbaf914dfd4c7e1f3ae5e' 
  AND token = 'tQ0ytRckL89HjQQut6m3ezsHjrRdZrDbw9+JhpYEXWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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