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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b60fc80cdc166b9d9f97e117452b47cd2e4ddff9cb4a5765c02f593be0783d0' 
  AND token = '5fbGriuu+iUFGlH52TddN6QQujGHrRW/oEPOxdhMpEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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