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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9deaf8076d46472f58a04e776072fe06d05b0423474d76fd632c1664be430ba' 
  AND token = 'hUIXlr0TYlnF666fKxGo8PS2aEYPHeWELuWeLPgFn5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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