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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'debcc2e4bcfb198d3cbe2537b077e7c9a515235a38bc46f59205fc16dc380edd' 
  AND token = '8a0o15doOg8IU55ZPbdGBd8gHElbLw4UxkP76oI9A6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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