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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd934794d7cedbab2c5dd0d1c40ed4d6b38f761205e262923f77565ca078c0639' 
  AND token = 'iQ2Vc3ohX3idC7QQ++3z6jSzWHBLEVgywtmaLcbVtOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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