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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c408a36dbb6351909240ab36714eeb899276c7e3486ed4a985a2de8674cbb9b' 
  AND token = '0PWekNOrtu8fLojUDkVSIJbaoutxN5ZB1A8YaTsS4Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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